- #1
seto6
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- 0
Homework Statement
Homework Equations
s2=c2(t2)-(x2)
The Attempt at a Solution
so..
s=72ly and t=100y c=c
(72)2=(1)2(1002)-(x2)
solving for x which is the distance i get x=69.39 aprox= 69.
my question is when do we know to let c=1 or c=3*108 m/s
how do we go back and forth between light year and year?